Asteroid 2010 RX30 passed within 154,000 miles of Earth at 5:51am ET on September 8. Approximately twelve hours later, at 5:12pm ET, asteroid 2010 RF12 is expected to pass within 49,088 miles of Earth. The asteroids are both estimated to be less than 70 feet in diameter and neither poses a threat to Earth. For comparison, the Moon is approximately 238,857 miles away.